Nonlinear dynamics and millikelvin cavity-cooling of levitated nanoparticles
arXiv:1511.08482 · doi:10.1103/PhysRevLett.117.173602
Abstract
Optomechanical systems explore and exploit the coupling between light and the mechanical motion of matter. A nonlinear coupling offers access to rich new physics, in both the quantum and classical regimes. We investigate a dynamic, as opposed to the usually studied static, nonlinear optomechanical system, comprising of a nanosphere levitated and cooled in a hybrid electro-optical trap. An optical cavity offers readout of both linear-in-position and quadratic-in-position (nonlinear) light-matter coupling, whilst simultaneously cooling the nanosphere to millikelvin temperatures for indefinite periods of time in high vacuum. We observe cooling of the linear and non-linear motion, leading to a fold reduction in phonon number , attaining final occupancies of . This work puts cavity cooling of a levitated object to the quantum ground-state firmly within reach.
5 pages
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